YOKOGAWA GS200 User Manual

Explanation
If common mode noise is superimposed on the signal passing through the GS200’s
output terminals, the noise current enters the internal source circuit from the output
terminals and changes the generated signal, as shown in figure (a).
To reduce this effect, a guard is furnished on the GS200’s source circuit and is connected
to the guard terminal, as shown in figure (b). If you connect the noise source to the guard
terminal, the noise current passes through the guard and is grounded, bypassing the
internal source circuit. In this way, you can reduce the amount of noise that enters the
circuit from the connected power source.
When the GS200 is connected to the DUT (it is directly connected to the noise source),
you can reduce the effect of common mode noise by turning the guard feature on. When
you do so, the connection becomes like the connection shown in figure (b). When the
GS200 is not connected to the DUT, as shown in figure (c), you can reduce the effect of
common mode noise by turning the guard feature off and directly connecting the DUT’s
ground (noise source) to the guard terminal.
Source
circuit
GS200
C
Chassis
R
DUT
Hi
Common noise
(a)
(b)
Lo
Noise current
Source
circuit
GS200
Chassis
DUT
Hi
Common noise
Lo
Noise current
Guard
G
Guard is on
C: Stray capacitance
R: Insulation resistance
(c)
Source
circuit
GS200
Chassis
DUT
Hi
Common noise
Lo
Noise current
Guard
G
Guard is off
Circuit
<<Corresponding Command Mnemonic>>
:SENSe:GUARd 1|0|ON|OFF
4.3 Setting the Guard Terminal
4-6
IM GS210-01EN

YOKOGAWA GS200 Specifications

General

Brand	YOKOGAWA
Model	GS200
Category	Power Supply
Language	English